There is a package called firefox-locale-en on my system (Ubuntu 20.04 lts), even though I have uninstalled Firefox on the very first day. Is it safe to purge it with sudo apt purge firefox-locale-en?
EDIT 1
If yes, what does it do?
EDIT 2
Even though it might sound like a silly doubt, but I would always like to have a knowledgeable person's opinion, because I remember last time python3.6 was not used by me specifically and I decided to purge it. Only to find out my PC doesn't work at all any more. And Hence I got to 20.04 from 18.04. Same way I thought firefox might be associated with some internet related service on Ubuntu.
A locale is a "set of parameters that defines the user's language, region and any special variant preferences that the user wants to see in their user interface -- usually a locale identifier consists of at least a language identifier and a region identifier." (Source Wikipedia)
It is safe to remove the
firefox-locale-enpackage because since you aren't using Firefox you have no use for firefox's locale.